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"For those who value democracy and free speech, the muzzling of Professor Palmer by a small number of senior party executives, simply for raising concerns, sets a frightening precedent," he said in a statement.

"I'm concerned that the LNP will be brought into disrepute if it does anything to damage the reputation of someone who has fought so hard for, and given so much to, the party."

Mr Bjelke-Petersen said Mr Palmer is a national living treasure who had played an important role in shaping Queensland and the National Party.

"All members of the LNP should support him as a result of everything he has done to bring the LNP into existence," he said.